I've been meaning to add that to AAAPAckageDev, but I never got around to doing it. I think Python provides a plist module too, so I suppose it'd be a matter of reading the plist and saving to .JSON-tmLanguage.

but the resulting JSON had some syntax error that wasn't obvious to me but was obvious to the syntax highlighter (most of the file was bright red inverted), and I gave up for the moment. I'll try some of the others though.